Reorganize net/disk_cache into backend specific directories.

net/disk_cache/v3/backend_worker.cc

Index: net/disk_cache/v3/backend_worker.cc
diff --git a/net/disk_cache/v3/backend_worker.cc b/net/disk_cache/v3/backend_worker.cc
index be12a96eebedbd19b32fe545eba807a1b26044b4..80f64412548c16f25d3ee672cc49cb7153116ed1 100644
--- a/net/disk_cache/v3/backend_worker.cc
+++ b/net/disk_cache/v3/backend_worker.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "net/disk_cache/backend_impl.h"
+#include "net/disk_cache/v3/backend_worker.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ -22,14 +22,14 @@
 #include "base/timer/timer.h"
 #include "net/base/net_errors.h"
 #include "net/disk_cache/cache_util.h"
-#include "net/disk_cache/entry_impl.h"
-#include "net/disk_cache/errors.h"
-#include "net/disk_cache/experiments.h"
-#include "net/disk_cache/file.h"
+#include "net/disk_cache/v2/entry_impl.h"
+#include "net/disk_cache/v2/errors.h"
+#include "net/disk_cache/v2/experiments.h"
+#include "net/disk_cache/v2/file.h"
 
 // This has to be defined before including histogram_macros.h from this file.
-#define NET_DISK_CACHE_BACKEND_IMPL_CC_
-#include "net/disk_cache/histogram_macros.h"
+#define NET_DISK_CACHE_BLOCKFILE_BACKEND_IMPL_CC_
+#include "net/disk_cache/v2/histogram_macros.h"
 
 using base::Time;
 using base::TimeDelta;